package com.springboot.util;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {
    private final static SimpleDateFormat sdfYear = new SimpleDateFormat("yyyy");

    private final static SimpleDateFormat sdfDay = new SimpleDateFormat("yyyy-MM-dd");

    private final static SimpleDateFormat sdfDays = new SimpleDateFormat("yyyyMMdd");

    private final static SimpleDateFormat sdfTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    /**
     * 获取YYYY格式
     * 
     * @return
     */
    public static String getYear() {
	return sdfYear.format(new Date());
    }

    /**
     * 获取YYYY-MM-DD格式
     * 
     * @return
     */
    public static String getDay() {
	return sdfDay.format(new Date());
    }

    /**
     * 获取YYYYMMDD格式
     * 
     * @return
     */
    public static String getDays() {
	return sdfDays.format(new Date());
    }

    /**
     * 获取YYYY-MM-DD HH:mm:ss格式
     * 
     * @return
     */
    public static String getTime() {
	return sdfTime.format(new Date());
    }

    /**
     * @Title: compareDate
     * @Description: TODO(日期比较，如果s>=e 返回true 否则返回false)
     * @param s
     * @param e
     * @return boolean
     * @throws @author
     *             luguosui
     */
    public static boolean compareDate(String s, String e) {
	if (fomatDate(s) == null || fomatDate(e) == null) {
	    return false;
	}
	return fomatDate(s).getTime() >= fomatDate(e).getTime();
    }

    /**
     * 格式化日期
     * 
     * @return
     */
    public static Date fomatDate(String date) {
	DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
	try {
	    return fmt.parse(date);
	} catch (ParseException e) {
	    e.printStackTrace();
	    return null;
	}
    }

    /**
     * 校验日期是否合法
     * 
     * @return
     */
    public static boolean isValidDate(String s) {
	DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
	try {
	    fmt.parse(s);
	    return true;
	} catch (Exception e) {
	    // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
	    return false;
	}
    }

    public static int getDiffYear(String startTime, String endTime) {
	DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
	try {
	    long aa = 0;
	    int years = (int) (((fmt.parse(endTime).getTime() - fmt.parse(startTime).getTime()) / (1000 * 60 * 60 * 24))
		    / 365);
	    return years;
	} catch (Exception e) {
	    // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
	    return 0;
	}
    }

    /**
     * <li>功能描述：时间相减得到天数
     * 
     * @param beginDateStr
     * @param endDateStr
     * @return long
     * @author Administrator
     */
    public static long getDaySub(String beginDateStr, String endDateStr) {
	long day = 0;
	java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");
	java.util.Date beginDate = null;
	java.util.Date endDate = null;

	try {
	    beginDate = format.parse(beginDateStr);
	    endDate = format.parse(endDateStr);
	} catch (ParseException e) {
	    e.printStackTrace();
	}
	day = (endDate.getTime() - beginDate.getTime()) / (24 * 60 * 60 * 1000);
	// System.out.println("相隔的天数="+day);

	return day;
    }

    /**
     * 得到n天之后的日期
     * 
     * @param days
     * @return
     */
    public static String getAfterDayDate(String days) {
	int daysInt = Integer.parseInt(days);

	Calendar canlendar = Calendar.getInstance(); // java.util包
	canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
	Date date = canlendar.getTime();

	SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	String dateStr = sdfd.format(date);

	return dateStr;
    }

    /**
     * 得到n天之后是周几
     * 
     * @param days
     * @return
     */
    public static String getAfterDayWeek(String days) {
	int daysInt = Integer.parseInt(days);

	Calendar canlendar = Calendar.getInstance(); // java.util包
	canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
	Date date = canlendar.getTime();

	SimpleDateFormat sdf = new SimpleDateFormat("E");
	String dateStr = sdf.format(date);

	return dateStr;
    }

    public static void main(String[] args) {
	System.out.println(getDays());
	System.out.println(getAfterDayWeek("3"));
    }

}
